#ifndef LLVM_MC_MCASSEMBLER_H
#define LLVM_MC_MCASSEMBLER_H
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/ilist.h"
#include "llvm/ADT/ilist_node.h"
-#include "llvm/MC/MCValue.h"
#include "llvm/Support/Casting.h"
+#include "llvm/MC/MCFixup.h"
+#include "llvm/MC/MCInst.h"
#include "llvm/Support/DataTypes.h"
#include <vector> // FIXME: Shouldn't be needed.
namespace llvm {
class raw_ostream;
+class MCAsmLayout;
class MCAssembler;
+class MCBinaryExpr;
+class MCContext;
+class MCCodeEmitter;
+class MCExpr;
+class MCFragment;
+class MCObjectWriter;
class MCSection;
class MCSectionData;
+class MCSymbol;
+class MCSymbolData;
+class MCValue;
+class TargetAsmBackend;
class MCFragment : public ilist_node<MCFragment> {
+ friend class MCAsmLayout;
+
MCFragment(const MCFragment&); // DO NOT IMPLEMENT
void operator=(const MCFragment&); // DO NOT IMPLEMENT
public:
enum FragmentType {
- FT_Data,
FT_Align,
+ FT_Data,
FT_Fill,
- FT_Org
+ FT_Inst,
+ FT_Org,
+ FT_Dwarf,
+ FT_LEB
};
private:
/// Parent - The data for the section this fragment is in.
MCSectionData *Parent;
+ /// Atom - The atom this fragment is in, as represented by it's defining
+ /// symbol. Atom's are only used by backends which set
+ /// \see MCAsmBackend::hasReliableSymbolDifference().
+ MCSymbolData *Atom;
+
/// @name Assembler Backend Data
/// @{
//
/// initialized.
uint64_t Offset;
- /// FileSize - The file size of this section. This is ~0 until initialized.
- uint64_t FileSize;
+ /// LayoutOrder - The layout order of this fragment.
+ unsigned LayoutOrder;
/// @}
MCSectionData *getParent() const { return Parent; }
void setParent(MCSectionData *Value) { Parent = Value; }
- // FIXME: This should be abstract, fix sentinel.
- virtual uint64_t getMaxFileSize() const {
- assert(0 && "Invalid getMaxFileSize call!");
- return 0;
- };
+ MCSymbolData *getAtom() const { return Atom; }
+ void setAtom(MCSymbolData *Value) { Atom = Value; }
+
+ unsigned getLayoutOrder() const { return LayoutOrder; }
+ void setLayoutOrder(unsigned Value) { LayoutOrder = Value; }
+
+ static bool classof(const MCFragment *O) { return true; }
- /// @name Assembler Backend Support
+ void dump();
+};
+
+class MCDataFragment : public MCFragment {
+ SmallString<32> Contents;
+
+ /// Fixups - The list of fixups in this fragment.
+ std::vector<MCFixup> Fixups;
+
+public:
+ typedef std::vector<MCFixup>::const_iterator const_fixup_iterator;
+ typedef std::vector<MCFixup>::iterator fixup_iterator;
+
+public:
+ MCDataFragment(MCSectionData *SD = 0) : MCFragment(FT_Data, SD) {}
+
+ /// @name Accessors
/// @{
- //
- // FIXME: This could all be kept private to the assembler implementation.
- uint64_t getAddress() const;
+ SmallString<32> &getContents() { return Contents; }
+ const SmallString<32> &getContents() const { return Contents; }
- uint64_t getFileSize() const {
- assert(FileSize != ~UINT64_C(0) && "File size not set!");
- return FileSize;
- }
- void setFileSize(uint64_t Value) {
- assert(Value <= getMaxFileSize() && "Invalid file size!");
- FileSize = Value;
- }
+ /// @}
+ /// @name Fixup Access
+ /// @{
- uint64_t getOffset() const {
- assert(Offset != ~UINT64_C(0) && "File offset not set!");
- return Offset;
+ void addFixup(MCFixup Fixup) {
+ // Enforce invariant that fixups are in offset order.
+ assert((Fixups.empty() || Fixup.getOffset() > Fixups.back().getOffset()) &&
+ "Fixups must be added in order!");
+ Fixups.push_back(Fixup);
}
- void setOffset(uint64_t Value) { Offset = Value; }
+
+ std::vector<MCFixup> &getFixups() { return Fixups; }
+ const std::vector<MCFixup> &getFixups() const { return Fixups; }
+
+ fixup_iterator fixup_begin() { return Fixups.begin(); }
+ const_fixup_iterator fixup_begin() const { return Fixups.begin(); }
+
+ fixup_iterator fixup_end() {return Fixups.end();}
+ const_fixup_iterator fixup_end() const {return Fixups.end();}
+
+ size_t fixup_size() const { return Fixups.size(); }
/// @}
- static bool classof(const MCFragment *O) { return true; }
+ static bool classof(const MCFragment *F) {
+ return F->getKind() == MCFragment::FT_Data;
+ }
+ static bool classof(const MCDataFragment *) { return true; }
};
-class MCDataFragment : public MCFragment {
- SmallString<32> Contents;
+// FIXME: This current incarnation of MCInstFragment doesn't make much sense, as
+// it is almost entirely a duplicate of MCDataFragment. If we decide to stick
+// with this approach (as opposed to making MCInstFragment a very light weight
+// object with just the MCInst and a code size, then we should just change
+// MCDataFragment to have an optional MCInst at its end.
+class MCInstFragment : public MCFragment {
+ /// Inst - The instruction this is a fragment for.
+ MCInst Inst;
+
+ /// Code - Binary data for the currently encoded instruction.
+ SmallString<8> Code;
+
+ /// Fixups - The list of fixups in this fragment.
+ SmallVector<MCFixup, 1> Fixups;
public:
- MCDataFragment(MCSectionData *SD = 0) : MCFragment(FT_Data, SD) {}
+ typedef SmallVectorImpl<MCFixup>::const_iterator const_fixup_iterator;
+ typedef SmallVectorImpl<MCFixup>::iterator fixup_iterator;
+
+public:
+ MCInstFragment(MCInst _Inst, MCSectionData *SD = 0)
+ : MCFragment(FT_Inst, SD), Inst(_Inst) {
+ }
/// @name Accessors
/// @{
- uint64_t getMaxFileSize() const {
- return Contents.size();
- }
+ SmallVectorImpl<char> &getCode() { return Code; }
+ const SmallVectorImpl<char> &getCode() const { return Code; }
- SmallString<32> &getContents() { return Contents; }
- const SmallString<32> &getContents() const { return Contents; }
+ unsigned getInstSize() const { return Code.size(); }
+
+ MCInst &getInst() { return Inst; }
+ const MCInst &getInst() const { return Inst; }
+
+ void setInst(MCInst Value) { Inst = Value; }
+
+ /// @}
+ /// @name Fixup Access
+ /// @{
+
+ SmallVectorImpl<MCFixup> &getFixups() { return Fixups; }
+ const SmallVectorImpl<MCFixup> &getFixups() const { return Fixups; }
+
+ fixup_iterator fixup_begin() { return Fixups.begin(); }
+ const_fixup_iterator fixup_begin() const { return Fixups.begin(); }
+
+ fixup_iterator fixup_end() {return Fixups.end();}
+ const_fixup_iterator fixup_end() const {return Fixups.end();}
+
+ size_t fixup_size() const { return Fixups.size(); }
/// @}
- static bool classof(const MCFragment *F) {
- return F->getKind() == MCFragment::FT_Data;
+ static bool classof(const MCFragment *F) {
+ return F->getKind() == MCFragment::FT_Inst;
}
- static bool classof(const MCDataFragment *) { return true; }
+ static bool classof(const MCInstFragment *) { return true; }
};
class MCAlignFragment : public MCFragment {
/// cannot be satisfied in this width then this fragment is ignored.
unsigned MaxBytesToEmit;
+ /// Size - The current estimate of the size.
+ unsigned Size;
+
+ /// EmitNops - Flag to indicate that (optimal) NOPs should be emitted instead
+ /// of using the provided value. The exact interpretation of this flag is
+ /// target dependent.
+ bool EmitNops : 1;
+
public:
MCAlignFragment(unsigned _Alignment, int64_t _Value, unsigned _ValueSize,
unsigned _MaxBytesToEmit, MCSectionData *SD = 0)
: MCFragment(FT_Align, SD), Alignment(_Alignment),
Value(_Value),ValueSize(_ValueSize),
- MaxBytesToEmit(_MaxBytesToEmit) {}
+ MaxBytesToEmit(_MaxBytesToEmit), Size(0), EmitNops(false) {}
/// @name Accessors
/// @{
- uint64_t getMaxFileSize() const {
- return std::max(Alignment - 1, MaxBytesToEmit);
- }
-
unsigned getAlignment() const { return Alignment; }
-
+
int64_t getValue() const { return Value; }
unsigned getValueSize() const { return ValueSize; }
+ unsigned getSize() const { return Size; }
+
+ void setSize(unsigned Size_) { Size = Size_; }
+
unsigned getMaxBytesToEmit() const { return MaxBytesToEmit; }
+ bool hasEmitNops() const { return EmitNops; }
+ void setEmitNops(bool Value) { EmitNops = Value; }
+
/// @}
- static bool classof(const MCFragment *F) {
- return F->getKind() == MCFragment::FT_Align;
+ static bool classof(const MCFragment *F) {
+ return F->getKind() == MCFragment::FT_Align;
}
static bool classof(const MCAlignFragment *) { return true; }
};
class MCFillFragment : public MCFragment {
/// Value - Value to use for filling bytes.
- MCValue Value;
+ int64_t Value;
- /// ValueSize - The size (in bytes) of \arg Value to use when filling.
+ /// ValueSize - The size (in bytes) of \arg Value to use when filling, or 0 if
+ /// this is a virtual fill fragment.
unsigned ValueSize;
- /// Count - The number of copies of \arg Value to insert.
- uint64_t Count;
+ /// Size - The number of bytes to insert.
+ uint64_t Size;
public:
- MCFillFragment(MCValue _Value, unsigned _ValueSize, uint64_t _Count,
- MCSectionData *SD = 0)
+ MCFillFragment(int64_t _Value, unsigned _ValueSize, uint64_t _Size,
+ MCSectionData *SD = 0)
: MCFragment(FT_Fill, SD),
- Value(_Value), ValueSize(_ValueSize), Count(_Count) {}
+ Value(_Value), ValueSize(_ValueSize), Size(_Size) {
+ assert((!ValueSize || (Size % ValueSize) == 0) &&
+ "Fill size must be a multiple of the value size!");
+ }
/// @name Accessors
/// @{
- uint64_t getMaxFileSize() const {
- return ValueSize * Count;
- }
+ int64_t getValue() const { return Value; }
- MCValue getValue() const { return Value; }
-
unsigned getValueSize() const { return ValueSize; }
- uint64_t getCount() const { return Count; }
+ uint64_t getSize() const { return Size; }
/// @}
- static bool classof(const MCFragment *F) {
- return F->getKind() == MCFragment::FT_Fill;
+ static bool classof(const MCFragment *F) {
+ return F->getKind() == MCFragment::FT_Fill;
}
static bool classof(const MCFillFragment *) { return true; }
};
class MCOrgFragment : public MCFragment {
/// Offset - The offset this fragment should start at.
- MCValue Offset;
+ const MCExpr *Offset;
- /// Value - Value to use for filling bytes.
+ /// Value - Value to use for filling bytes.
int8_t Value;
+ /// Size - The current estimate of the size.
+ unsigned Size;
+
public:
- MCOrgFragment(MCValue _Offset, int8_t _Value, MCSectionData *SD = 0)
+ MCOrgFragment(const MCExpr &_Offset, int8_t _Value, MCSectionData *SD = 0)
: MCFragment(FT_Org, SD),
- Offset(_Offset), Value(_Value) {}
+ Offset(&_Offset), Value(_Value), Size(0) {}
+
/// @name Accessors
/// @{
- uint64_t getMaxFileSize() const {
- // FIXME: This doesn't make much sense.
- return ~UINT64_C(0);
- }
+ const MCExpr &getOffset() const { return *Offset; }
- MCValue getOffset() const { return Offset; }
-
uint8_t getValue() const { return Value; }
+ unsigned getSize() const { return Size; }
+
+ void setSize(unsigned Size_) { Size = Size_; }
/// @}
- static bool classof(const MCFragment *F) {
- return F->getKind() == MCFragment::FT_Org;
+ static bool classof(const MCFragment *F) {
+ return F->getKind() == MCFragment::FT_Org;
}
static bool classof(const MCOrgFragment *) { return true; }
};
+class MCLEBFragment : public MCFragment {
+ /// Value - The value this fragment should contain.
+ const MCExpr *Value;
+
+ /// IsSigned - True if this is a sleb128, false if uleb128.
+ bool IsSigned;
+
+ SmallString<8> Contents;
+public:
+ MCLEBFragment(const MCExpr &Value_, bool IsSigned_, MCSectionData *SD)
+ : MCFragment(FT_LEB, SD),
+ Value(&Value_), IsSigned(IsSigned_) { Contents.push_back(0); }
+
+ /// @name Accessors
+ /// @{
+
+ const MCExpr &getValue() const { return *Value; }
+
+ bool isSigned() const { return IsSigned; }
+
+ SmallString<8> &getContents() { return Contents; }
+ const SmallString<8> &getContents() const { return Contents; }
+
+ /// @}
+
+ static bool classof(const MCFragment *F) {
+ return F->getKind() == MCFragment::FT_LEB;
+ }
+ static bool classof(const MCLEBFragment *) { return true; }
+};
+
+class MCDwarfLineAddrFragment : public MCFragment {
+ /// LineDelta - the value of the difference between the two line numbers
+ /// between two .loc dwarf directives.
+ int64_t LineDelta;
+
+ /// AddrDelta - The expression for the difference of the two symbols that
+ /// make up the address delta between two .loc dwarf directives.
+ const MCExpr *AddrDelta;
+
+ SmallString<8> Contents;
+
+public:
+ MCDwarfLineAddrFragment(int64_t _LineDelta, const MCExpr &_AddrDelta,
+ MCSectionData *SD = 0)
+ : MCFragment(FT_Dwarf, SD),
+ LineDelta(_LineDelta), AddrDelta(&_AddrDelta) { Contents.push_back(0); }
+
+ /// @name Accessors
+ /// @{
+
+ int64_t getLineDelta() const { return LineDelta; }
+
+ const MCExpr &getAddrDelta() const { return *AddrDelta; }
+
+ SmallString<8> &getContents() { return Contents; }
+ const SmallString<8> &getContents() const { return Contents; }
+
+ /// @}
+
+ static bool classof(const MCFragment *F) {
+ return F->getKind() == MCFragment::FT_Dwarf;
+ }
+ static bool classof(const MCDwarfLineAddrFragment *) { return true; }
+};
+
// FIXME: Should this be a separate class, or just merged into MCSection? Since
// we anticipate the fast path being through an MCAssembler, the only reason to
// keep it out is for API abstraction.
class MCSectionData : public ilist_node<MCSectionData> {
+ friend class MCAsmLayout;
+
MCSectionData(const MCSectionData&); // DO NOT IMPLEMENT
void operator=(const MCSectionData&); // DO NOT IMPLEMENT
public:
- /// Fixup - Represent a fixed size region of bytes inside some fragment which
- /// needs to be rewritten. This region will either be rewritten by the
- /// assembler or cause a relocation entry to be generated.
- struct Fixup {
- /// Fragment - The fragment containing the fixup.
- MCFragment *Fragment;
-
- /// Offset - The offset inside the fragment which needs to be rewritten.
- uint64_t Offset;
-
- /// Value - The expression to eventually write into the fragment.
- //
- // FIXME: We could probably get away with requiring the client to pass in an
- // owned reference whose lifetime extends past that of the fixup.
- MCValue Value;
-
- /// Size - The fixup size.
- unsigned Size;
-
- /// FixedValue - The value to replace the fix up by.
- //
- // FIXME: This should not be here.
- uint64_t FixedValue;
-
- public:
- Fixup(MCFragment &_Fragment, uint64_t _Offset, const MCValue &_Value,
- unsigned _Size)
- : Fragment(&_Fragment), Offset(_Offset), Value(_Value), Size(_Size),
- FixedValue(0) {}
- };
-
typedef iplist<MCFragment> FragmentListType;
typedef FragmentListType::const_iterator const_iterator;
typedef FragmentListType::iterator iterator;
- typedef std::vector<Fixup>::const_iterator const_fixup_iterator;
- typedef std::vector<Fixup>::iterator fixup_iterator;
+ typedef FragmentListType::const_reverse_iterator const_reverse_iterator;
+ typedef FragmentListType::reverse_iterator reverse_iterator;
private:
- iplist<MCFragment> Fragments;
+ FragmentListType Fragments;
const MCSection *Section;
+ /// Ordinal - The section index in the assemblers section list.
+ unsigned Ordinal;
+
+ /// LayoutOrder - The index of this section in the layout order.
+ unsigned LayoutOrder;
+
/// Alignment - The maximum alignment seen in this section.
unsigned Alignment;
//
// FIXME: This could all be kept private to the assembler implementation.
- /// Address - The computed address of this section. This is ~0 until
- /// initialized.
- uint64_t Address;
-
- /// Size - The content size of this section. This is ~0 until initialized.
- uint64_t Size;
-
- /// FileSize - The size of this section in the object file. This is ~0 until
- /// initialized.
- uint64_t FileSize;
-
- /// LastFixupLookup - Cache for the last looked up fixup.
- mutable unsigned LastFixupLookup;
+ /// HasInstructions - Whether this section has had instructions emitted into
+ /// it.
+ unsigned HasInstructions : 1;
- /// Fixups - The list of fixups in this section.
- std::vector<Fixup> Fixups;
-
/// @}
-public:
+public:
// Only for use as sentinel.
MCSectionData();
MCSectionData(const MCSection &Section, MCAssembler *A = 0);
unsigned getAlignment() const { return Alignment; }
void setAlignment(unsigned Value) { Alignment = Value; }
+ bool hasInstructions() const { return HasInstructions; }
+ void setHasInstructions(bool Value) { HasInstructions = Value; }
+
+ unsigned getOrdinal() const { return Ordinal; }
+ void setOrdinal(unsigned Value) { Ordinal = Value; }
+
+ unsigned getLayoutOrder() const { return LayoutOrder; }
+ void setLayoutOrder(unsigned Value) { LayoutOrder = Value; }
+
/// @name Fragment Access
/// @{
iterator end() { return Fragments.end(); }
const_iterator end() const { return Fragments.end(); }
- size_t size() const { return Fragments.size(); }
-
- bool empty() const { return Fragments.empty(); }
-
- /// @}
- /// @name Fixup Access
- /// @{
-
- std::vector<Fixup> &getFixups() {
- return Fixups;
- }
-
- fixup_iterator fixup_begin() {
- return Fixups.begin();
- }
-
- fixup_iterator fixup_end() {
- return Fixups.end();
- }
-
- size_t fixup_size() const { return Fixups.size(); }
-
- /// @}
- /// @name Assembler Backend Support
- /// @{
- //
- // FIXME: This could all be kept private to the assembler implementation.
+ reverse_iterator rbegin() { return Fragments.rbegin(); }
+ const_reverse_iterator rbegin() const { return Fragments.rbegin(); }
- /// LookupFixup - Look up the fixup for the given \arg Fragment and \arg
- /// Offset.
- ///
- /// If multiple fixups exist for the same fragment and offset it is undefined
- /// which one is returned.
- //
- // FIXME: This isn't horribly slow in practice, but there are much nicer
- // solutions to applying the fixups.
- const Fixup *LookupFixup(const MCFragment *Fragment, uint64_t Offset) const;
+ reverse_iterator rend() { return Fragments.rend(); }
+ const_reverse_iterator rend() const { return Fragments.rend(); }
- uint64_t getAddress() const {
- assert(Address != ~UINT64_C(0) && "Address not set!");
- return Address;
- }
- void setAddress(uint64_t Value) { Address = Value; }
+ size_t size() const { return Fragments.size(); }
- uint64_t getSize() const {
- assert(Size != ~UINT64_C(0) && "File size not set!");
- return Size;
- }
- void setSize(uint64_t Value) { Size = Value; }
+ bool empty() const { return Fragments.empty(); }
- uint64_t getFileSize() const {
- assert(FileSize != ~UINT64_C(0) && "File size not set!");
- return FileSize;
- }
- void setFileSize(uint64_t Value) { FileSize = Value; }
+ void dump();
/// @}
};
// FIXME: Same concerns as with SectionData.
class MCSymbolData : public ilist_node<MCSymbolData> {
public:
- MCSymbol &Symbol;
+ const MCSymbol *Symbol;
/// Fragment - The fragment this symbol's value is relative to, if any.
MCFragment *Fragment;
/// Offset - The offset to apply to the fragment address to form this symbol's
/// value.
uint64_t Offset;
-
+
/// IsExternal - True if this symbol is visible outside this translation
/// unit.
unsigned IsExternal : 1;
/// IsPrivateExtern - True if this symbol is private extern.
unsigned IsPrivateExtern : 1;
+ /// CommonSize - The size of the symbol, if it is 'common', or 0.
+ //
+ // FIXME: Pack this in with other fields? We could put it in offset, since a
+ // common symbol can never get a definition.
+ uint64_t CommonSize;
+
+ /// SymbolSize - An expression describing how to calculate the size of
+ /// a symbol. If a symbol has no size this field will be NULL.
+ const MCExpr *SymbolSize;
+
+ /// CommonAlign - The alignment of the symbol, if it is 'common'.
+ //
+ // FIXME: Pack this in with other fields?
+ unsigned CommonAlign;
+
/// Flags - The Flags field is used by object file implementations to store
/// additional per symbol information which is not easily classified.
uint32_t Flags;
public:
// Only for use as sentinel.
MCSymbolData();
- MCSymbolData(MCSymbol &_Symbol, MCFragment *_Fragment, uint64_t _Offset,
+ MCSymbolData(const MCSymbol &_Symbol, MCFragment *_Fragment, uint64_t _Offset,
MCAssembler *A = 0);
/// @name Accessors
/// @{
- MCSymbol &getSymbol() const { return Symbol; }
+ const MCSymbol &getSymbol() const { return *Symbol; }
MCFragment *getFragment() const { return Fragment; }
void setFragment(MCFragment *Value) { Fragment = Value; }
/// @}
/// @name Symbol Attributes
/// @{
-
+
bool isExternal() const { return IsExternal; }
void setExternal(bool Value) { IsExternal = Value; }
-
+
bool isPrivateExtern() const { return IsPrivateExtern; }
void setPrivateExtern(bool Value) { IsPrivateExtern = Value; }
-
+
+ /// isCommon - Is this a 'common' symbol.
+ bool isCommon() const { return CommonSize != 0; }
+
+ /// setCommon - Mark this symbol as being 'common'.
+ ///
+ /// \param Size - The size of the symbol.
+ /// \param Align - The alignment of the symbol.
+ void setCommon(uint64_t Size, unsigned Align) {
+ CommonSize = Size;
+ CommonAlign = Align;
+ }
+
+ /// getCommonSize - Return the size of a 'common' symbol.
+ uint64_t getCommonSize() const {
+ assert(isCommon() && "Not a 'common' symbol!");
+ return CommonSize;
+ }
+
+ void setSize(const MCExpr *SS) {
+ SymbolSize = SS;
+ }
+
+ const MCExpr *getSize() const {
+ return SymbolSize;
+ }
+
+
+ /// getCommonAlignment - Return the alignment of a 'common' symbol.
+ unsigned getCommonAlignment() const {
+ assert(isCommon() && "Not a 'common' symbol!");
+ return CommonAlign;
+ }
+
/// getFlags - Get the (implementation defined) symbol flags.
uint32_t getFlags() const { return Flags; }
/// setFlags - Set the (implementation defined) symbol flags.
void setFlags(uint32_t Value) { Flags = Value; }
-
+
+ /// modifyFlags - Modify the flags via a mask
+ void modifyFlags(uint32_t Value, uint32_t Mask) {
+ Flags = (Flags & ~Mask) | Value;
+ }
+
/// getIndex - Get the (implementation defined) index.
uint64_t getIndex() const { return Index; }
/// setIndex - Set the (implementation defined) index.
void setIndex(uint64_t Value) { Index = Value; }
-
- /// @}
+
+ /// @}
+
+ void dump();
};
// FIXME: This really doesn't belong here. See comments below.
};
class MCAssembler {
+ friend class MCAsmLayout;
+
public:
typedef iplist<MCSectionData> SectionDataListType;
typedef iplist<MCSymbolData> SymbolDataListType;
typedef SymbolDataListType::const_iterator const_symbol_iterator;
typedef SymbolDataListType::iterator symbol_iterator;
+ typedef std::vector<IndirectSymbolData>::const_iterator
+ const_indirect_symbol_iterator;
typedef std::vector<IndirectSymbolData>::iterator indirect_symbol_iterator;
private:
MCAssembler(const MCAssembler&); // DO NOT IMPLEMENT
void operator=(const MCAssembler&); // DO NOT IMPLEMENT
+ MCContext &Context;
+
+ TargetAsmBackend &Backend;
+
+ MCCodeEmitter &Emitter;
+
+ MCObjectWriter &Writer;
+
raw_ostream &OS;
-
+
iplist<MCSectionData> Sections;
iplist<MCSymbolData> Symbols;
+ /// The map of sections to their associated assembler backend data.
+ //
+ // FIXME: Avoid this indirection?
+ DenseMap<const MCSection*, MCSectionData*> SectionMap;
+
+ /// The map of symbols to their associated assembler backend data.
+ //
+ // FIXME: Avoid this indirection?
+ DenseMap<const MCSymbol*, MCSymbolData*> SymbolMap;
+
std::vector<IndirectSymbolData> IndirectSymbols;
+ /// The set of function symbols for which a .thumb_func directive has
+ /// been seen.
+ //
+ // FIXME: We really would like this in target specific code rather than
+ // here. Maybe when the relocation stuff moves to target specific,
+ // this can go with it? The streamer would need some target specific
+ // refactoring too.
+ SmallPtrSet<const MCSymbol*, 64> ThumbFuncs;
+
+ unsigned RelaxAll : 1;
unsigned SubsectionsViaSymbols : 1;
private:
- /// LayoutSection - Assign offsets and sizes to the fragments in the section
- /// \arg SD, and update the section size. The section file offset should
- /// already have been computed.
+ /// Evaluate a fixup to a relocatable expression and the value which should be
+ /// placed into the fixup.
///
- /// \param NextAlign - The alignment for the section end address, which may
- /// add padding bytes to the section (these are included in the section "file"
- /// size, but not its regular size).
- void LayoutSection(MCSectionData &SD, unsigned NextAlign);
+ /// \param Layout The layout to use for evaluation.
+ /// \param Fixup The fixup to evaluate.
+ /// \param DF The fragment the fixup is inside.
+ /// \param Target [out] On return, the relocatable expression the fixup
+ /// evaluates to.
+ /// \param Value [out] On return, the value of the fixup as currently layed
+ /// out.
+ /// \return Whether the fixup value was fully resolved. This is true if the
+ /// \arg Value result is fixed, otherwise the value may change due to
+ /// relocation.
+ bool EvaluateFixup(const MCAsmLayout &Layout,
+ const MCFixup &Fixup, const MCFragment *DF,
+ MCValue &Target, uint64_t &Value) const;
+
+ /// Check whether a fixup can be satisfied, or whether it needs to be relaxed
+ /// (increased in size, in order to hold its value correctly).
+ bool FixupNeedsRelaxation(const MCFixup &Fixup, const MCFragment *DF,
+ const MCAsmLayout &Layout) const;
+
+ /// Check whether the given fragment needs relaxation.
+ bool FragmentNeedsRelaxation(const MCInstFragment *IF,
+ const MCAsmLayout &Layout) const;
+
+ /// LayoutOnce - Perform one layout iteration and return true if any offsets
+ /// were adjusted.
+ bool LayoutOnce(MCAsmLayout &Layout);
+
+ bool LayoutSectionOnce(MCAsmLayout &Layout, MCSectionData &SD);
+
+ bool RelaxInstruction(MCAsmLayout &Layout, MCInstFragment &IF);
+
+ bool RelaxOrg(MCAsmLayout &Layout, MCOrgFragment &OF);
+
+ bool RelaxLEB(MCAsmLayout &Layout, MCLEBFragment &IF);
+
+ bool RelaxDwarfLineAddr(MCAsmLayout &Layout, MCDwarfLineAddrFragment &DF);
+
+ bool RelaxAlignment(MCAsmLayout &Layout, MCAlignFragment &DF);
+
+ /// FinishLayout - Finalize a layout, including fragment lowering.
+ void FinishLayout(MCAsmLayout &Layout);
+
+ uint64_t HandleFixup(const MCAsmLayout &Layout,
+ MCFragment &F, const MCFixup &Fixup);
+
+public:
+ /// Compute the effective fragment size assuming it is layed out at the given
+ /// \arg SectionAddress and \arg FragmentOffset.
+ uint64_t ComputeFragmentSize(const MCFragment &F) const;
+
+ /// Find the symbol which defines the atom containing the given symbol, or
+ /// null if there is no such symbol.
+ const MCSymbolData *getAtom(const MCSymbolData *Symbol) const;
+
+ /// Check whether a particular symbol is visible to the linker and is required
+ /// in the symbol table, or whether it can be discarded by the assembler. This
+ /// also effects whether the assembler treats the label as potentially
+ /// defining a separate atom.
+ bool isSymbolLinkerVisible(const MCSymbol &SD) const;
+
+ /// Emit the section contents using the given object writer.
+ void WriteSectionData(const MCSectionData *Section,
+ const MCAsmLayout &Layout) const;
+
+ /// Check whether a given symbol has been flagged with .thumb_func.
+ bool isThumbFunc(const MCSymbol *Func) const {
+ return ThumbFuncs.count(Func);
+ }
+
+ /// Flag a function symbol as the target of a .thumb_func directive.
+ void setIsThumbFunc(const MCSymbol *Func) { ThumbFuncs.insert(Func); }
public:
/// Construct a new assembler instance.
// concrete and require clients to pass in a target like object. The other
// option is to make this abstract, and have targets provide concrete
// implementations as we do with AsmParser.
- MCAssembler(raw_ostream &OS);
+ MCAssembler(MCContext &Context_, TargetAsmBackend &Backend_,
+ MCCodeEmitter &Emitter_, MCObjectWriter &Writer_,
+ raw_ostream &OS);
~MCAssembler();
+ MCContext &getContext() const { return Context; }
+
+ TargetAsmBackend &getBackend() const { return Backend; }
+
+ MCCodeEmitter &getEmitter() const { return Emitter; }
+
+ MCObjectWriter &getWriter() const { return Writer; }
+
/// Finish - Do final processing and write the object to the output stream.
+ /// \arg Writer is used for custom object writer (as the MCJIT does),
+ /// if not specified it is automatically created from backend.
void Finish();
// FIXME: This does not belong here.
SubsectionsViaSymbols = Value;
}
+ bool getRelaxAll() const { return RelaxAll; }
+ void setRelaxAll(bool Value) { RelaxAll = Value; }
+
/// @name Section List Access
/// @{
const SectionDataListType &getSectionList() const { return Sections; }
- SectionDataListType &getSectionList() { return Sections; }
+ SectionDataListType &getSectionList() { return Sections; }
iterator begin() { return Sections.begin(); }
const_iterator begin() const { return Sections.begin(); }
indirect_symbol_iterator indirect_symbol_begin() {
return IndirectSymbols.begin();
}
+ const_indirect_symbol_iterator indirect_symbol_begin() const {
+ return IndirectSymbols.begin();
+ }
indirect_symbol_iterator indirect_symbol_end() {
return IndirectSymbols.end();
}
+ const_indirect_symbol_iterator indirect_symbol_end() const {
+ return IndirectSymbols.end();
+ }
size_t indirect_symbol_size() const { return IndirectSymbols.size(); }
/// @}
+ /// @name Backend Data Access
+ /// @{
+
+ MCSectionData &getSectionData(const MCSection &Section) const {
+ MCSectionData *Entry = SectionMap.lookup(&Section);
+ assert(Entry && "Missing section data!");
+ return *Entry;
+ }
+
+ MCSectionData &getOrCreateSectionData(const MCSection &Section,
+ bool *Created = 0) {
+ MCSectionData *&Entry = SectionMap[&Section];
+
+ if (Created) *Created = !Entry;
+ if (!Entry)
+ Entry = new MCSectionData(Section, this);
+
+ return *Entry;
+ }
+
+ MCSymbolData &getSymbolData(const MCSymbol &Symbol) const {
+ MCSymbolData *Entry = SymbolMap.lookup(&Symbol);
+ assert(Entry && "Missing symbol data!");
+ return *Entry;
+ }
+
+ MCSymbolData &getOrCreateSymbolData(const MCSymbol &Symbol,
+ bool *Created = 0) {
+ MCSymbolData *&Entry = SymbolMap[&Symbol];
+
+ if (Created) *Created = !Entry;
+ if (!Entry)
+ Entry = new MCSymbolData(Symbol, 0, 0, this);
+
+ return *Entry;
+ }
+
+ /// @}
+
+ void dump();
};
} // end namespace llvm
projects / oota-llvm.git / blobdiff